The M4 Delta 12 Nylon fibre features a high rate of fire along with a 300rd high capacity magazine so you can put more BBs on target faster than you can count. The 12" front rail system has top picatinny rail and a bottom keymod rail. The sides of the handguard will accept add-on modular rail segments. Front and rear flip up sights are included with plenty of rail space for you to mount a scope. The quick change spring feature allows you to change the power of the weapon quickly and easily (upgrade spring not included) so you're ready for all environments and ranges of play.